Q11 (2 Viewers)

[Rafy]

Discuss your answers to Q11 here.

 

[Jashua_Long]

Re: Scanned copy of 2012 paper

I don't know why Q11 (e) is worth 3 marks. It's just a logarithm

 

[iampeterr]

Re: Scanned copy of 2012 paper

I don't know why Q11 (e) is worth 3 marks. It's just a logarithm

i use logs then i saw it and thought no way this was worth 3 marks .. then i did a plus 1 minus one to the top and ended up with tan ==" ......... fuck my life.

 

[cartoonmaiz]

Yeah... it was worth quite a lot...

 

[Skeptyks]

Re: Scanned copy of 2012 paper

I don't know why Q11 (e) is worth 3 marks. It's just a logarithm

shit i missed that question..

 

[nucgaek]

pretty sure if it's 3 marks they want you to use substitutions and do it fully instead of just going straight to log

 

[Nws m8]

Re: General Thoughts: Mathematics Ext 2

what did youse get for integration of e^2x one question?

we had to use patrial fractions too eh?

 

[someth1ng]

Re: General Thoughts: Mathematics Ext 2

what did youse get for integration of e^2x one question?

we had to use patrial fractions too eh?

I did the log base e by factorising 1/2.

 

[OMGITzJustin]

Re: General Thoughts: Mathematics Ext 2

log?

 

[someth1ng]

pretty sure if it's 3 marks they want you to use substitutions and do it fully instead of just going straight to log

If you get the right answer, it's fine.

 

[Nws m8]

Re: General Thoughts: Mathematics Ext 2

I did the log base e by factorising 1/2.

yeah i used sub=e^2x ... did u ?

 

[lolcakes52]

Re: General Thoughts: Mathematics Ext 2

yeah i used sub=e^2x ... did u ?

Nope let u =e^x, comes to u/u^2+1

 

[someth1ng]

Re: General Thoughts: Mathematics Ext 2

1/2 integral 2e^2x / e^2x + 1

=1/2 ln (e^2x + 1)

 

[tomp1612]

Re: General Thoughts: Mathematics Ext 2

1/2 integral 2e^2x / e^2x + 1

=1/2 ln (e^2x + 1)

yea I got that

 

[Nws m8]

Re: General Thoughts: Mathematics Ext 2

Nope let u =e^x, comes to u/u^2+1

That's what I did first, then I redid the question ....

I got 1/2 ln (u) - ln (u^2 + 1) from 1 to e^2 (did someone get this?)

 

[Student8]

Re: General Thoughts: Mathematics Ext 2

1/2 integral 2e^2x / e^2x + 1

=1/2 ln (e^2x + 1)

pop, fastest way (reverse chain rule)

 

[lonelynight99]

Re: General Thoughts: Mathematics Ext 2

what did youse get for integration of e^2x one question?

we had to use patrial fractions too eh?

I left my answer in this form: 1- 1/2(ln.......)
Is that ok?

 

[Nws m8]

Re: General Thoughts: Mathematics Ext 2

I left my answer in this form: 1- 1/2(ln.......)
Is that ok?

lol bro
u had to use the limits ....

 

[Nws m8]

Re: General Thoughts: Mathematics Ext 2

That's what I did first, then I redid the question ....

I got 1/2 ln (u) - ln (u^2 + 1) from 1 to e^2 (did someone get this?)

 

[someth1ng]

Re: General Thoughts: Mathematics Ext 2

That's what I did first, then I redid the question ....

I got 1/2 ln (u) - ln (u^2 + 1) from 1 to e^2 (did someone get this?)

Did you sub in limits?